package com.company.section4;

/**
 * @author cbf4Life cbf4life@126.com
 * I'm glad to share my knowledge with you all.
 */
public class Calculator {
    //加符号
    private final static String ADD_SYMBOL = "+";
    //减符号
    private final static String SUB_SYMBOL = "-";

    public int exec(int a, int b, String symbol) {
        return symbol.equals(ADD_SYMBOL) ? a + b : a - b;
    }

}
